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Custom Soil Resource Report <br />Flood plain <br />The nearly level plain that borders a stream and is subject to flooding unless <br />protected artificially. <br />Flood -plain landforms <br />A variety of constructional and erosional features produced by stream channel <br />migration and flooding. Examples include backswamps, flood -plain splays, <br />meanders, meander belts, meander scrolls, oxbow lakes, and natural levees. <br />Flood -plain splay <br />A fan - shaped deposit or other outspread deposit formed where an overloaded <br />stream breaks through a levee (natural or artificial) and deposits its material <br />(commonly coarse grained) on the flood plain. <br />Flood -plain step <br />An essentially flat, terrace -like alluvial surface within a valley that is frequently <br />covered by floodwater from the present stream; any approximately horizontal <br />surface still actively modified by fluvial scour and /or deposition. May occur <br />individually or as a series of steps. <br />Fluvial <br />Of or pertaining to rivers or streams; produced by stream or river action. <br />Foothills <br />A region of steeply sloping hills that fringes a mountain range or high - plateau <br />escarpment. The hills have relief of as much as 1,000 feet (300 meters). <br />Footslope <br />The concave surface at the base of a hillslope. A footslope is a transition zone <br />between upslope sites of erosion and transport (shoulders and backslopes) and <br />downslope sites of deposition (toeslopes). <br />Forb <br />Any herbaceous plant not a grass or a sedge. <br />Forest cover <br />All trees and other woody plants (underbrush) covering the ground in a forest. <br />Forest type <br />A stand of trees similar in composition and development because of given physical <br />and biological factors by which it may be differentiated from other stands. <br />Fragipan <br />A loamy, brittle subsurface horizon low in porosity and content of organic matter <br />and low or moderate in clay but high in silt or very fine sand. A fragipan appears <br />cemented and restricts roots. When dry, it is hard or very hard and has a higher <br />bulk density than the horizon or horizons above. When moist, it tends to rupture <br />suddenly under pressure rather than to deform slowly. <br />99 <br />